Physical
Mount
Required
The
host
requested
a
specific
volser
or
specified
a
category
that
was
not
designated
as
a
“Fast
Ready”
category.
The
volser
needed
to
satisfy
the
mount
operation
is
not
resident
in
the
tape
volume
cache
and
must
be
recalled
from
the
physical
tape.
The
Library
Manager
directs
the
cartridge
accessor
to
move
the
required
physical
volume
to
a
tape
drive
that
the
VTS
or
TS7700
Virtualization
Engine
manages
so
that
the
recall
operation
can
be
performed.
Demount
Operations
The
3494
Tape
Library
performs
a
physical
demount
operation
whenever
a
volume
is
unloaded
from
a
physical
tape
drive.
A
similar
operation
occurs
for
the
virtual
tape
drives
within
a
VTS
or
TS7700
Virtualization
Engine.
When
a
virtual
volume
is
unloaded
from
a
virtual
tape
drive,
a
logical
demount
operation
is
performed.
The
following
are
two
types
of
demount
operations:
v
A
demount
was
requested,
and
the
volume
is
currently
at
the
tape
drive.
For
a
physical
demount,
this
operation
is
used
to
move
a
volume
from
a
tape
drive
to
a
storage
cell.
When
the
volume
is
placed
in
the
storage
cell,
the
demount
is
considered
complete.
For
a
logical
demount,
this
operation
updates
the
status
of
the
virtual
volume
in
the
Library
Manager
database
to
indicate
that
it
is
no
longer
mounted.
No
physical
movement
of
a
volume
is
involved.
v
A
demount
was
requested,
but
the
volume
has
not
been
mounted.
This
operation
is
used
to
cancel
a
mount
operation
that
has
not
been
started.
The
library
recognizes
that
because
a
demount
request
was
received
for
a
mount
that
has
not
occurred,
the
host
must
not
want
the
mount.
Therefore,
the
two
requests
cancel
each
other.
Eject
Operations
An
eject
operation
results
in
a
physical
cartridge
being
placed
in
a
cell
of
an
output
facility
in
the
3494
Tape
Library.
The
type
of
output
facility
may
be
either
the
convenience
I/O
station
or
the
high-capacity
output
facility.
The
host
specifies
the
type
of
facility
as
part
of
the
eject
request.
An
eject
request
is
considered
complete
when
the
specified
cartridge
is
placed
in
the
cell
of
an
output
station.
On
completion,
the
specified
volume
is
removed
from
the
Library
Manager
inventory.
Logical
volumes
that
a
VTS
or
TS7700
Virtualization
Engine
manages
cannot
be
ejected
unless
they
are
assigned
to
the
Insert
category
or
to
a
category
designated
as
“Fast
Ready”.
Any
host
request
to
eject
a
logical
volume
not
in
the
Insert
category
or
in
a
“Fast
Ready”
category
will
fail.
An
ejected
logical
volume
is
removed
from
the
Library
Manager
inventory.
Audit
Operations
An
audit
uses
the
vision
system
to
ensure
that
the
physical
cartridge
associated
with
the
volser
specified
in
the
request
is
physically
in
the
3494
Tape
Library
where
expected.
If
the
volser
specified
in
the
request
is
a
physical
volume
that
is
in
the
Library
Manager’s
inventory,
the
audit
operation
checks
the
external
label
of
the
cartridge
in
the
storage
cell
specified
in
the
Library
Manager
database.
It
must
match
what
is
in
the
database.
If
the
volume
is
mounted
on
a
tape
drive,
the
audit
is
held
until
the
volume
is
demounted
and
returned
to
its
storage
cell.
If
the
volser
specified
is
a
logical
volume
in
the
Library
Manager’s
inventory,
the
Library
Manager
determines
the
physical
volume
on
which
the
logical
volume
resides
and
performs
an
audit
of
that
physical
volume.
The
audit
operation
is
Chapter
3.
Operational
Characteristics
91
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